<template>
    <div class="sidebar">
        <el-menu
            class="sidebar-el-menu"
            :default-active="onRoutes"
            :collapse="collapse"
            background-color="#403D39"
            text-color="#bfcbd9"
            active-text-color="#EB5E28"
            unique-opened
            router
        >
            <template v-for="item in items">
                <template v-if="item.subs && (item.user === 'all' || item.user === role)">
                    <el-submenu :index="item.index" :key="item.index">
                        <template slot="title">
                            <i :class="item.icon"></i>
                            <span slot="title">{{ item.title }}</span>
                        </template>
                        <template v-for="subItem in item.subs">
                            <el-submenu
                                v-if="subItem.subs && (item.user === 'all' || item.user === role)"
                                :index="subItem.index"
                                :key="subItem.index"
                            >
                                <template slot="title">{{ subItem.title }}</template>
                                <el-menu-item
                                    v-for="(threeItem,i) in subItem.subs"
                                    :key="i"
                                    :index="threeItem.index"
                                >{{ threeItem.title }}</el-menu-item>
                            </el-submenu>
                            <el-menu-item
                                v-else-if="subItem.user === 'all' || subItem.user === role"
                                :index="subItem.index"
                                :key="subItem.index"
                            >{{ subItem.title }}</el-menu-item>
                        </template>
                    </el-submenu>
                </template>
                <template v-else-if='item.user === "all" || item.user === role'>
                    <el-menu-item :index="item.index" :key="item.index">
                        <i :class="item.icon"></i>
                        <span slot="title">{{ item.title }}</span>
                    </el-menu-item>
                </template>
            </template>
        </el-menu>
    </div>
</template>

<script>
import bus from './bus';
export default {
    data() {
        return {
            collapse: false,
            items: [
                {
                    icon: "el-icon-lx-home",
                    index: "dashboard",
                    title: "系统首页",
                    user: "all"
                },
                // {
                //     icon: "el-icon-lx-rank",
                //     index: "contest",
                //     title: "比赛",
                //     user: "all"
                // },
                {
                    icon: "el-icon-edit-outline",
                    index: "3",
                    title: "信息查询",
                    subs: [
                        {
                            icon: "el-icon-lx-sort",
                            index: "gradeInfo",
                            title: "成绩信息",
                            user: "all"
                        },
                        {
                            icon: "el-icon-lx-sort",
                            index: "courseInfo",
                            title: "选课信息",
                            user: "supervisor"
                        },
                        // {
                        //     icon: "el-icon-lx-sort",
                        //     index: "courseInfo",
                        //     title: "选课信息",
                        //     user: "teacher"
                        // },
                        {
                            icon: "el-icon-lx-sort",
                            index: "courseInfo",
                            title: "选课信息",
                            user: "student"
                        },
                        {
                            icon: "el-icon-lx-sort",
                            index: "teachInfo",
                            title: "授课信息",
                            user: "supervisor"
                        },
                        {
                            icon: "el-icon-lx-sort",
                            index: "teachInfo",
                            title: "授课信息",
                            user: "teacher"
                        },
                        {
                            icon: "el-icon-lx-sort",
                            index: "allCourses",
                            title: "所有课程",
                            user: "all"
                        },
                        {
                            icon: "el-icon-lx-sort",
                            index: "rankInfo",
                            title: "排名信息",
                            user: "student"
                        },
                        {
                            icon: "el-icon-lx-sort",
                            index: "rankInfo",
                            title: "排名信息",
                            user: "supervisor"
                        }
                    ],
                    user: "all"
                },
                {
                    icon: "el-icon-edit-outline",
                    index: "4",
                    title: "信息管理",
                    subs: [
                        {
                            icon: "el-icon-lx-sort",
                            index: "studentInfo",
                            title: "学生信息",
                            user: "supervisor"
                        },
                        {
                            icon: "el-icon-lx-sort",
                            index: "teacherInfo",
                            title: "教师信息",
                            user: "supervisor"
                        },
                        {
                            icon: "el-icon-lx-sort",
                            index: "updateCourses",
                            title: "课程管理",
                            user: "supervisor"
                        },
                        {
                            icon: "el-icon-lx-sort",
                            index: "courseSelectUpdate",
                            title: "选课管理",
                            user: "supervisor"
                        },
                        {
                            icon: "el-icon-lx-sort",
                            index: "scoreInsert",
                            title: "成绩录入",
                            user: "supervisor"
                        }
                    ],
                    user: "supervisor"
                },
                {
                    icon: "el-icon-edit-outline",
                    index: "4",
                    title: "信息管理",
                    subs: [
                        {
                            icon: "el-icon-lx-sort",
                            index: "scoreInsert",
                            title: "成绩录入",
                            user: "teacher"
                        }
                    ],
                    user: "teacher"
                },
                {
                    icon: "el-icon-service",
                    index: "/about",
                    title: "关于我们",
                    user: "all"
                }
            ]
        };
    },
    computed: {
        onRoutes() {
            return this.$route.path.replace('/', '');
        },
        role() {
            return localStorage.getItem("ms_character");
        }
    },
    created() {
        // 通过 Event Bus 进行组件间通信，来折叠侧边栏
        bus.$on('collapse', msg => {
            this.collapse = msg;
            bus.$emit('collapse-content', msg);
        });
    }
};
</script>

<style scoped>
.sidebar {
    display: block;
    position: absolute;
    left: 0;
    top: 70px;
    bottom: 0;
    overflow-y: scroll;
}
.sidebar::-webkit-scrollbar {
    width: 0;
}
.sidebar-el-menu:not(.el-menu--collapse) {
    width: 250px;
}
.sidebar > ul {
    height: 100%;
}
</style>
